Click the "Select fonts" button, select the OpenType font file and click "Open" to upload it to the site. Click "TTF" in the "Convert To" field to convert the font to TrueType format.

As an alternative, you can install any TrueType font by dragging the *.ttf file into the Add Fonts box at the top of the Fonts page in Settings. To uninstall a font, open its metadata page and ...

Open it, and you will see the following interface. Click Add files and then browse for Mac formatted font (.dfont) files that you want to convert into a Windows-compatible TrueType (.ttf) font file.