there was a judgement set place in california on Dec.2020 and I have not yet received the judgement signed by judge ..want to appeal it?

You have a couple of different problems.  First, tracking down the order -- it should not still be outstanding three months later, and it is possible it has been entered and your copy was just never served.  In any event, there are multiple things possible -- an appeal, possibly, but probably more effective a motion for reconsideration or rehearing showing actual payment/assessment of the same sums in a prior judgment.  Either way, you are going to have to speak with California counsel on the matter; no one in Nevada is going to be able to do anything to resolve the situation, and you should contact a lawyer in San Bernardino County.