Tap and hold the lemmy id of the user you want to DM such as @ObsidianFlux@fedinsfw.app and then you will see a "Send message" button.
post
replies:
Alternatively go to the user profile and use the three dots menu:

Tap and hold the lemmy id of the user you want to DM such as @ObsidianFlux@fedinsfw.app and then you will see a "Send message" button.
Alternatively go to the user profile and use the three dots menu:

all 4 comments