Selecting the Form Signatures tile in the Tiles page, or Forms > Form Signatures from the side menu, will open a list of WebForm Signatures needing your attention. This page shows any signatures which have been linked to your user account.
Any signatures with the status Completed have already had a signature added by you; any with Pending still need a signature. If a signature has the status Ready to Sign, you can select ... > Fill and Sign next to it in the list to open up the form in a new tab.
For more information, take a look at the full help page for WebForm Signatures.
Keywords: Assigned forms, outstanding signatures, required signatories