How much will I charge for posting and commenting on forums for a client

[Metu]

Hello,
Got a job I apply for posting on forum but is my first job. How much will a post on forum cost ? Please if you have done these job before . How do you charge it per post or
I need you guidance.
Thank you

 

[GenesisOne]

Try to make it reasonable:
How much time does it takes - daily - weekly - monthly
Multiply the amount of hours it takes to do the job for your rate per hour.