The Overview tab can be found under the Profile section.
This is where you can see your personal profile, including your name, role (in Proply), email address and mobile number.
It's also where you can edit your profile details, including your profile picture.
Note: The profile details you set here will be what's used for all proposals that you create. If you update your details here, they will update on all published proposals (not just new proposals you send).