To join signature campaign find a project that will start ico soon , usually they do signature campaigns till ico end . Some of them let you do it even after ico .
Im currently doing BelugaPay bounty campaign . If you got twitter followers or facebook page you can get some stakes there aswell.
Here is beluga bounty thread
https://bitcointalk.org/index.php?topic=2294773To register fill out google form for signature campaign , put your signature based on your rank, join telegram chanel if you got some questions . People will help you there .
Signature campaign will last till March 31 , so you still got time to earn something
Have a nice day