How to drag click on bloody abedless?

So, i just got this mouse, but since its the first time buying a mouse specifically for drag clicking i really dont know how to do it, and i also had seen that some People uses a type of masking idk why, so yeah, i want to learn how to drag click with it.

So, i just got this mouse, but since its the first time buying a mouse specifically for drag clicking i really dont know how to do it, and i also had seen that some People uses a type of masking idk why, so yeah, i want to learn how to drag click with it.