Your profile must be complete and approved on Sollective to have the ability to apply to projects.
See How do I complete and submit my profile? for details on how to complete your profile.
Once your profile has been approved, you can apply to projects by clicking the [Apply to Project] button and messaging why you're applying. This lets recruiters know that you’re interested, and if they think you’re a great fit, they’ll be able to reach out to you!