green bar

[fire katon]

about how to increase the green small bar which is present above the profile picture.

[Albear]

There is nothing you can do about your bar by yourself. It will become longer if other members give you a positive rep. Looks like it's red for you right now. That means someone gave you a negative reputation mark. I'll give you some positive.
If you wanna give reps to other people, click the star sign next to dislike button at the bottom of someone's post.