I can’t find Peacock TV to add

Exactly what model Roku do you have? Peacock is not available on older Roku's. You can find your model by going to Settings/System/About.

This is the current list for Peacock:

Roku:

Roku 2 (4210X model only)
Roku 3 & 4 (model 4200X or later)
Roku Streaming Stick (model 3600X or later)
Roku Express/Express+ (model 3900X or later)
Roku Premiere/Premiere+ (model 3920X or later)
Roku Ultra/Ultra LT (model 4640X or later) 
Roku TV and Smart Soundbar (model 5000X or later)