Upon searching for your place of interest, and verifying that indeed its missing on the map / list, you can add or create it.
To create / add a place on the map, locate and click on the Add(+) icon at the top right of your screen. Fill in the required information on the page that opens, and click on submit.
When filling in the required information while creating / adding a place, all the mandatory fields have stars/asterisks. They must be filled in order for to you to be able to submit, otherwise the submit button will remain inactive(grey in color).