Put the chain on BIG:BIG.
Using the method in the pic below, measure the amount of slack.
You want at least 1", but less than 2".
How much do you have>
What may be VERY important is what are the SIZE of your chain rings? That RDER doesn't have a large amount of chain wrap. Something like 26T and your new cassette is using 16T of that. That means the difference between your largest & smallest ring can't exceed 10T without possible problems.
BTW, most pics of your don't help.