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If you want to do that exactly like the example application, you can leave the others settings to default (you don't need to change the settings which is not said there).
For example:
In ytvgalid custom thread field settings, there is no custom setting supplied for Settable Value Permissions setting. So you can leave the settings to default (blank by default).
In ytvgalcat custom thread field settings, there is no custom setting supplied for Display Format setting. So you can leave the settings to default ({VALUE} by default).

If you want to modify the example application as your needs, you can change those settings (maybe you need to know what is each settings for by reading the XThreads Documentation and each settings descriptions, then try it).