In order to print return address labels in Mac Pages, you will need to have a template that you can use. You can find many templates online, or you can create your own using the “Mailings” feature in Pages.
To use a template, simply download the template and open it in Pages. Once the template is open, you can edit the information on the labels to match your return address. Once you’re finished, you can print the labels.
If you want to create your own template, open Pages and select “Mailings” from the toolbar. From the Mailings menu, select “Labels.” In the Labels window, you can choose the type of label you would like to use and customize the layout. Once you are finished, you can print the labels.
If you need further assistance with printing return address labels on Mac Pages, you can refer to the Apple support page here: https://support.apple.com/en-us/HT201453.
I hope this information helps and good luck with your project!