This post was helpful to me in the beginning...
http://community.livejournal.com/menstrual_cups/453392.html

Check the FOLDING tags. There was recently a post by a fellow list member who made a great video. I'm sure you'll find it there.

Check to make sure the holes are not clogged before you re-insert.

If you're more of the visual type, there's a fantastic video of all the folds: http://www.youtube.com/watch?v=R-PX3BWwjPY. My favorite is the triangle/extreme seven fold.

As for your leaking, there are a few ways to check that the cup is open, like spinning it or feeling for dents, but is it possible that your leaking isn't due to the cup being mis-placed (I rarely feel an actual popping sensation when my cup successfully opens and forms a seal), but, rather, that you are experiencing the slow leak of residual blood that got into the vagina when you removed and cleaned your cup? It's a very common type of "leaking" but the only thing you can do to fix it is to insert a finger and try to use it to clean out any of that blood, or to use a pantyliner or wear dark underwear. Anyway, if you described the leaking, it would probably be easier to figure out what the problem might be.

Good luck, and be patient with yourself!

Thank you for the great link! There sure are useful folds out there!!
I thought about residual blood, but that would stop at some point, wouldn't it?
Whereas I put the cup in and 30 mins later I have red blood in my pantyliner. And it keeps coming. There is a bit of blood in the cup, but it seems to go half in the cup, half "out & about".
Also, when I insert a finger to run around the cup to check if cervix is covered and cup unfolded I have a wee bit of blood.
That blood would definitely NOT make those stains.

Sometimes I ask myself if checking internally with the finger is not what causes the seal to break?

I will try another fold.
And the sucking in air with the vagina. Anybody knows how to do that?

It sounds like the cup might not be opening fully or you might be partially missing your cervix. Want to try my method?

I use the punch-down fold with the punched part facing down. Facing down, it makes a difference. I hold it with my thumb and middle finger, insert the cup so the rim is just past my pubic bone and then use my index finger to create an air channel so it opens fully. Then I nudge the stem rearward to point the cup toward my cervix and give it a boost as I Kegel the cup up and in.

If you prefer other folds, try them facing up and down... sometimes it makes a difference.

Hi Fireaphid,

I've been examining the whole situation down there in depth (quite : ) literally) and came to the conclusion that the rim of the cup was leaning across my cervix.
Since my vagina is short, the cup really must be cupping the cervix.
I wonder if I will be able to one day insert the cup without having to double-check internally, but even if this is the case, it is well worth the effort. No more tampons in the oceans from me!

Thank you ladies!
I'm actually looking foreward to my next menstruation. I hope I will not have a loooonf folicular phase, as I've had once or twice before.....

My mooncup (UK) leaks but only when I'm bleeding heavy and/or it's full.

What I do is after I insert it I wiggle it around a bit and try to feel if the cup has any idents (which would indicate not a good seal). Somtimes I do a kegal or two and that works or I try and rotate it. Though I've found that sometimes it will open right as I'm washing my hands. I feel a "pop" and there it goes.

I hope this helps!