Procedure:

Step 01: Log in to your Wix account and go to the Dashboard. Step 02: Click on the gear icon and select Site Settings from the drop-down menu. Step 03: Click on the Domains tab and then click on the Advanced Settings button. Step 04: Scroll down to the DNS Settings section and click on the Add Record button. Step 05: In the Add DNS Record window, select TXT from the Type drop-down menu. Step 06: In the Name field, enter @ Step 07: In the Value field, enter the SPF record you want to add.
For example: v=spf1 include:spf.wix.com ~all
Step 08: Click on the Save button.