I found one more solution.
So, after Apperance->Widgets->Image I inserted picture of WA banner to my sidebar. Picture you can download from Direct link :
https://my.wealthyaffiliate.com/banners/show/wealthy_affiliate_going_up.jpg
Then you need to "Edit Image". In DISPLAY SETTINGS you should choose Custom URL and insert Main link from $ in top menu section Links&Tracking. And second what you have to do is checking Open link in new tab in ADVANCES OPTONS.
It seems pretty simple to me, and I hope can help to somebody.