Open the “My Websites” section in your mssg.me personal account, you can go to this section by clicking here
Click on one of the created sites
Open the “Edit page” section
Click on the previously added block
Click on the “Duplicate” button at the bottom of the page
Note:
if after enter the block editing were made changes to it, then in order to duplicate this block, you must first save the changes, and then reopen the block for editing and duplicate it;
you can duplicate a block only within one site, that is, you cannot duplicate a block to another site