When the advertisement is shown, you can at any time, press the back button on your device to close the advertisement.
If you prefer, you can purchase a monthly or yearly subscription to upgrade to the PRO version.
Press the PRO icon at the top, and choose "PRO Editing - Monthly Subscription" or "PRO Editing - Yearly Subscription" and follow the in-app purchase steps. With the subscription you get to remove all advertisements from the app, import up to 5 minute videos from gallery, use the 3 x 3 frame, and personalize the watermark with your own name/text (up to 20 characters).
You can also get to the upgrades screen by pressing the gear icon at the top right and selecting "Purchase Upgrades".