How do i set the string of Rich Text Component?

Hey All,

I just downloaded the new Cocos Creator 3.0 and i was trying to make a basic game of guessing words from picture with letters as input.

Currently for showing the letters I can show the letter as a Rich Text Component but i am unable to set the string property of it as its giving the issue that the left side of the expression is not editable.

Please help me with this.

@alkane Can you provide a demo that reproduces the problem?

Please do elaborate your question with supporting images or something!