Shanling STP 80

Ok newbie ? I have the above amp with EL 34 and I would like to give the KT88 a try since they sound nicer and have more of a rich detail bass. I was informed that I need to biased the amp, however, I have no clue as to how to perform that task can anybody show me or explain PLEASE? What are the pro's and con's and will my system suffer?

I contacted shanling numerous times but to no avail! Wow, great customer service :(