There are three kinds of mods
Stream mods (Grey M)
Community mods (Green M)
Global mods (Purple M)
You can get a stream mod by
a.) Creating your own stream.
b.) Being given mod by a stream owner.
The chances of becoming a community or global mod are slim to none.
Here are some helpful streams for new users.
imgflip.com/m/Imgflip_Tutorials
imgflip.com/m/How_2_Imgflip
Enjoy your time here on Imgflip, best of wishes RMK.