I would like to update my rhuanfps tag artist to RK and my OC. take rocket_ (rhuanfps) to rocket_ (RK) without getting edit post one by one. I can not change because I do not know the site commands to do this. The artist tag Pcred566, he changed his nickname for Clade, and someone around here updated with the current nick without editing one by one.

You can request an alias for both of those things. Use this form and insert the older tag in the top bar, and the newer tag in the bottom bar. The form can not accept multiple tag requests at once, so you will have to fill out a second one for your other tag.