Edit: i dont wanna reflash my n900

Seen this? http://wiki.maemo.org/Free_up_rootfs_space

If you installed a package via xterm, remove it with "apt-get remove <packagename>" (you must be root).

i dont know what the name of the package, i installed it with this code
cd ~
wget http://www.runescape.com/downloads/runescape.msi -O $HOME/runescape.msi
7z e -o$HOME/rs_client $HOME/runescape.msi
7z e -o$HOME/rs_client/cabfile $HOME/rs_client/rslauncher.cab
mkdir -p $HOME/runescape/bin
mv $HOME/rs_client/cabfile/JagexAppletViewerJarFile.* $HOME/runescape/bin/jagexappletviewer.jar
mkdir $HOME/runescape/images
mv $HOME/rs_client/cabfile/JagexAppletViewerPngFile $HOME/runescape/images/jagexappletviewer.png

Well you could ask whoever told you to do that how to un-do it.

But I'll take a stab at it and guess if you ran this as root (did you?), and you've ended up with a load of files in /root/runescape/ and /root/rs_client/ ? I'd just delete them - but like I said, ask whoever told you this!

ok theres a file from runescape it has 95,7 mb, i looked up the root folder with fileBox, i cant delete it in filebox, how to delete the files in root, /root/.jagex_cache_32/main_file_cache.dat2

thanks already for helping me out

WARNING: This is potentially dangerous. I'd recommend reading this: http://wiki.maemo.org/Root_access first to understand the risks of doing stuff as root.

OK, first become the root user:
You should already be in the /root directory. Check this with the 'pwd' (print working directory) command:
It should say "/root". If it doesn't, change to the /root directory:
Then do the 'pwd' again and make sure it replies "/root". If not, do not go any further!
Now delete the subdirectoy. Make sure you get this command correct as it will delete stuff!
Now you can check the space on the root filesystem:
...and hopefully you'll have 95.7Mb more than you did before.

thank you, its working now