This is a typical setup screen. There are several types of setup items. Some require typing and others have a menu or a switch.
Name on this setup requires an alpha name. Clicking on the item will make it all blue and a new name can be typed in. Do not click to put the name after the "Name:" as this will result in Name:Name:airline name. Leave it all blue and type the name in. This will replace the whole thing with a new name and the program will add the Name: tag when its typed.
Now look at the domestic item. Here it says No. To change that, just click and it will change to Yes and back on the next click. Other items also behave like that where a switch is used. For example Local time and UTC will just switch.
Other items will have a menu. Sometimes these menus will be a left or right click menu or either. Example here is Flight splits has an Add split menu. This just allows interaction with the user rather than making a new split because it was clicked on. Other items may have more complicated menus depending on the choices.