Applying for a gig is easy.
Make sure to complete your profile before applying.
To apply for a gig:
1) Go to a specific listing you want to apply for.
2) Click on the mail icon in order to get a link for the host's profile:
3) Go to host's profile and click on "Send Collaboration Request":
Host will then have three options:
1) They may contact you to discuss further details about the project.
2) They can accept your collaboration request and invite you to a project.
3) They can ignore your request if they don't think you're suitable for a project.