How do they tag someone on a reply

Question

Example: dign_code that's a good idea
Whenever I type someone's name it does not get highlighted

Answer 1

Just type '@' and a list will pop up!
Choose a name from the list!
Or if you remember the username then you can just type his/her name
dign_code

Unfortunately, you cannot tag all people!

Answer 2

dign_code there are limitations to prevent spamming and all. And unnecessary tags

Answer 3

Namit Jain thanks it's works

Answer 4

Namit Jain why can't all peeps be tagged

Answer 5

Namit Jain ohh okay, thanks