1.What is a FireMonkey Style Template?

FM Style Template is a template for the "Bitmap Style Designer" tool (Tools > Bitmap Style Designer).

For more information about the Bitmap Style Designer please read the documentation here:

http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Bitmap_Style_Designer

2. How can I use the templates from www.delphistyles.com?

FM Style Templates do not depend on the FM style format and you can use the templates in IDEs right back to XE5 -

just run Bitmap Style Designer from your current IDE,

open the template and save it as FM style (*.style) with an appropriate name.

Then you can use *.style files in a TStyleBook component.

For more information please read the documentation:

http://docwiki.embarcadero.com/Libraries/Tokyo/en/FMX.Controls.TStyleBook

http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Customizing_FireMonkey_Applications_with_Styles

3. Can I edit FM Style Templates from www.delphistyles.com?

Yes, you have full rights to edit and rename the style templates.

To edit and test them, you must use the Bitmap Style Designer tool.

For more information please read the documentation:

http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Bitmap_Style_Designer

Information about how to export / import images from style templates:

http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Working_with_Images_in_the_Bitmap_Style_Designer

4. How can I add additional elements to the FM Style Template?

See this blog post all about this:

https://community.embarcadero.com/blogs/entry/using-the-bitmap-style-designer-to-create-a-custom-style