Hi A1919.
Welcome to the forum!
Where you place the stop loss is up to you.
For newer traders, I suggest that on a buy entry you place the SL just below the lower 25ema or just outside the Cap Channel. Opposite for sell entries. You can even move the SL to break even or to lock in some profit when you can.
*If you choose to do the new Counter Trend - there is typically no stop loss. Although you certainly can add one if you like. There would be no specific place to put it other than protecting your own tolerance for any loss.
If you don’t have access to the Cap Channel, you can use another channel indicator. It won’t have the mid point line, but you can simulate the outer channel lines. As I posted above, on the Eur/Usd 5 minute chart, the Envelopes indicator set to Smoothed 40, with atr of 0.08 looks good.