What is the most logical next event?

How to write an address on a package
Print or write the delivery address parallel to the longest side of the package.
You will want to write both addresses on the side of your package with the largest surface area. This will give you enough room to write the addresses with space between both to avoid any confusion.
Do not write your address over a seam in your box. Use a pen or permanent marker to make the address as clear as possible.