To create one from scratch, the user would select the "Add" button.

Once selected, the user will be prompted with the below pop up that will require them to name their register map.

In our case, when we created our connector, we specified "test" as being our register map so we'll name it "test".

Once the user creates the register map, it would become visible under the "Register Map" option where they can select it to edit it.

Once the register map is selected on the left tree under Register Map, the user can add more registers by selecting the Add button or manually editing it via the Edit Source option.

Note: Notice that a "ping" register is automatically added by default. This is required and needs to be a valid ping register in order to test connectivity to the slave. Modify it to match a register that exists or if you know what it is change it to that.