Your profile says you joined on Jan 11, 2018; however, you upgraded to a premium a week ago so that you may have gotten credits for your first domain.

When further upgrading to PP+, you do not qualify for another.

If you were to upgrade to PP+ right from the start, you would have qualified for two.

Your question shows twice on the panel Hi i upgraded to premium plus and i am trying to get another domain but it says i dont have any cred

The advice I was given is to build your first website for 6 months before adding a new domain, might i suggest that you send your message to either Kyle or Carson who will be able to answer it in much more detail, hope this helps and may I take this opportunity to wish you all the very best wishes for your journey to success here at Wealthy Affiliate.