#[1]

Same way as the other bird app

@useryouwantotag

@ and handle name (case-sensitive)

I though you put @ followed by the npub

#[1]

"@" start typing user handle -depending on the client (IRIS SNORT ...) using it will pick up the npub key automatic - unless FRESH / bit account

if the account brand new or NIP 05 not done some problem may happen - using @ raw npub will always WORK