Where can I add options for "Select" witget on UI designer

I´m trying to create a form where the user can select the number of the house and room that is renting.
but I don’t know where can I add the houses to display that information clicking on the bar.
Please tell me where should I add those alternatives to display them as options.

Example:
houses:
* house 1
* house 2
* house 3

Regards.

Hi,
have a look on the “Getting started” page at section " Create forms ". You can create a variable(in json format) in the UI-Designer which holds the desired values (example from “Getting started”: [{“label”: “Approve request”, “value”: “approved”},{“label”: “Refuse request”, “value”: “refused”}]) and then add the variable in the “Available values” property field.

The fields “Displayed key”(label) and “Returned key”(value) can be use to define the displayed text and the value behind.