To create a Trial for a level you will need to go to UMP Dashboard -> Levels. Next we will create a new level, in our example we will have the slug: premium_01 and label: Premium.
In this section set the Access Type to Regular Period and set up your own duration.
Next we will take a look at the billing options and what to set.
Payment Type: Payment
Level Price: you choose how much it costs
Billing Recurrences: On Going
Trial Period Price: you can set it to 0 to make the trial free, otherwise set up your custom amount.
Trial Period Type: here you will have two options Certain Period and Couple cycles subscription payments. With certain period you can choose how long this trial will last, you can pick from days, weeks, months, years. With the second option you can choose how many bill cycles have the trial period price after which the following ones use the level price.