Front has a verb and a tense, eg "comer (imperfecto)", and back has the conjugation. As there are 18 different tenses, I recommend doing a custom study session unless you need to brush up on the future subjunctive.
In Anki, select the deck and click "Custom Study". Then choose, "Study by card state or tag" and then "choose tags". Check "Require one or more tags" and select the tenses you are interested in studying. Another option is to create a filtered deck.
The script to create the import file for Anki is at
https://github.com/jemdiggity/spanish_conj_anki