how do you do this? ive noticed that guys use what look like sweat bands, but when i do this it slides out of it or slides up and down the strap what am i doing wrong, and what else can i use to hold it in place?

thanks for any help you have with this guys
im not sure wanna use tape coz i change guitars a lot and wanna use the wireless with them all
hmmm could work tho ive got strap locks on all of my guitars might take a bit of time to do that