OSMC can't connect to wifi on Raspberry Pi2

Hello peple!
I have a problem with my OSMC on my Raspberry. It will not log on my wifi, no matter which version I’m using, and if I install OpenELEC (that’s probably a tabu in here), then it is too unstable to stream fluently.
Some time ago, there was no problem OSMC to log on to the internet, but it got unstable and I had to reinstall it at then it got messed up.

Hope someone can help me.
And ps: I’m not very technical, so please be patient with me :slightly_smiling:

Kind regards
A frustrated Raspberry user

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