On BLDUP you can claim your company page which allows you to tag projects and add updates to your company's profile.
Once logged in, select the content/marketing overview under the Marketing tab located on the green navigation bar.
Claim an organization that is already on BLDUP or add an organization to BLDUP using the green buttons highlighted above.
Note: Once claiming an organization it typically takes 24-48hrs to be approved before you can start editing content.