To add a font, click Add font in the upper right hand corner of the page. Then choose the fonts that you wish to upload and give each font a name. You have the ability to upload four separate faces of one font at the same time. These will appear as one line item in the font list, instead of four. Click Save when you're finished choosing your files.
You need to upload the actual OTF or TTF file. You cannot upload a ZIP archive

To modify a font, click Modify in the appropriate row. Modify the desired fonts and save changes.
To delete a font, click Delete in the appropriate row. Confirm deletion of font(s).