To make your Brief 100% complete:
Go to the BriefLink homepage. Click "Edit Brief" for the chosen Brief.
Complete each Brief section on the left sidebar. Each completed section title will have a check mark next to it.
After completing all the sections, the sidebar and progress bar should look like this:
*Note: Optional sections are not counted. If you choose to complete each section except the optional sections, your Brief will still be counted as 100% complete.