To add masking effects in WordPress, you can follow these steps:
1. Install and activate the WP MaskIt plugin.
2. Create or edit the page/post where you want to add the masking effect.
3. In the page/post editor, click on the Add MaskIt button.
4. Choose the type of masking effect you want to add (e.g., image, text, shape).
5. Customize the masking effect (e.g., select image, choose text, set shape parameters).
6. Preview the effect and adjust if necessary.
7. Insert the masking effect to your page/post and save your changes.
Note: WP MaskIt has a basic version available for free, but some advanced features require a premium subscription.