Hi! I played a couple games on KGS, but I was losing at first. Then, I started to read Go for Beginners and I can tell I've improved, but I don't know how much...

I'm currently listed as [?] and my estimated level is still at 25k. The last game I played was 10 minutes ago where I've beaten someone playing black with 5-stones handicap and I was white. I'm a bit confused right now...

Any advice would be appreciated.

Thanks!

Try to relax, play some games. Seriously, I don't think there's anything better than that. Your performance will vary greatly between games at this level, but eventually the number beside your name will be right.

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Occupy Babel!

to know your KGS rank, play rated games (preferably against players with an established rank)

Just play. A preoccupation with rating is detrimental to progress. You will get a rating all in good time and when you do don't worry about it - just play.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).