UI for Xamarin does not currently have a WYSIWYG text editor, you can post a feature request in the UI for Xamarin Feedback Portal. The dev team is always looking for new ideas and controls to build out the suite and the suggestions posted in that portal are used to start new development.
To save you some time in you future inquiries about what controls the suite has, you can find a full list of the available Xamarin.Forms controls in the UI for Xamarin documentation under the "Xamarin Forms Controls" node, attached is a screenshot to help guide you.
If you have any technical problems using the controls, you can get direct assistance from the developers and support team by opening a Support Ticket instead of a forum post. We do monitor the forums, however this is limited by available resources. Whereas Support Tickets carry a guaranteed response time.
Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
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