Maintenance for the week of March 25:
• [COMPLETE] ESO Store and Account System for maintenance – March 28, 9:00AM EDT (13:00 UTC) - 12:00PM EDT (16:00 UTC)
Buy or craft the glyph you want instead, and then it's as simple as selecting the jewelry piece and using the "enchant" option. The glyph you want to put on it, assuming it's the proper level, etc. will be available in a list.