i read that 8 EMA is a better trailing stop on a rising stock
is there a way to set it in thinkorswim ?

youtube has a lot of TOS videos.

I (try to ) trade futures. I haven't used a trailing stop, manually enter stops as I'm watching the price move. I lose some money when a trending future pulls back before continuing in the same direction. Wonder how advanced traders deal with that to stay in the trade.

Good luck to you

-Bel