You already learned how to conjugate a verb with a separable prefix in the present tense. You place the prefix at the end of the sentence and conjugate the verb normally. For example, the infinitive ansehen (to look at) looks like this when conjugated in the present tense:

In the past tense, the main part of the verb is conjugated the same way you already learned:

There are no new rules for forming the future tense. Just conjugate werden and place the entire infinitive at the end of the sentence. For example, the infinitive aufstehen (to get up) is conjugated in the first person as follows: Ich werde … aufstehen. The infinitive ausgeben (to spend) in the future looks like: Er wird … ausgeben.