1) Go to Extensions -> Choose "Modules"

2) Next, click the "Search Tools" button.

3. Then you click "- Select Type -" and choose "whatsapp".

4. Click the title of the modules that you want to edit.

5) Click "module" button .

6) Edit the "phone" field to change your whatsapp contact number.

7) Edit the "link" field to change your whatsapp link.