Metamagic Feats

[Krothos]

Sorry if this is a "noob" question, but I can't figure out how to add metamagic feats to my prepared spells. For example, I want to memorize extended magic vestment. I found where I can increase the spell level used (click the up arrow next to the prepared spell name). And I can "rename" the prepared spell name to include the word "extended" (right-click on the spell name). But both of these options are clunky in their use. I thought there was a way to add the metamagic feat while selecting the prepared spell and it would adjust the spell level used and rename it appropriately automatically. Am I wrong?

Thanks for any insight you may provide.