How to modifiy interface font size? Absolutely new of Blender, I do have great difficulties to follow tutorials, because the size font appear on my screen 3840x2160 too much small, and I (myope) have to unwear glasses and approach the screen to read.
How I can change the font size of the interface ? 
I couldn't do by the usual Windows screen Tools.....

Many thanks...
Bruno
Just go into User Preferences [CTRL+ALT+U], then select the Themes tab, and then Text Style on the sidebar.