If you want to change the frequency for a sweepstakes or a gallery. Go down to your form editor.
The form editor is automatically set on step 2. So, go ahead an click on step one.
From there, you'll see two drop arrows. One will the the frequency (meaning once, twice, up to infinity), and how often (per day, week, month) a contestant can enter your contest.
Remember, all you need to do is change it, and Aptivada will save automatically.
For more on steps 1 through 4 of your entry form, click here.