Welcome aboard.
Lots of newbie tips in this thread –
Beginner questions - Support - Xert Community Forum (xertonline.com)
While you could adjust your signature, I’d suggest riding a BT (breakthrough) workout on your smart trainer as the quickest way to validate your signature.
The best time to tackle a BT workout is when you are feeling especially fresh (blue/green) such as after a rest day or low intensity days. Search the workout library for “breakthrough” and pick one. Ride it in Slope mode on EBC using gears and cadence to hit targets and exceed them where you are able (without blowing up). The most important section is the wind up to a sprint effort as MPA is drawn down. Right before you are about to collapse, stand and spin to high rpm and try to go all out for 5-7secs or longer.
No Decay setting is useful for long periods when you don’t expect to challenge yourself much.
Optimal Decay ensures more BT’s more often especially with sufficient training load (ex. 3+ stars) and a desire to push yourself on high intensity days with BT potential workouts or hardness level workouts or simply group rides with similar efforts (ZRL or IRL).