Texmaker - Where to type 'H' for help?

I'm trying to resolve an error in my latex document. The box at the bottom of texmaker says:

``````Type H <return> for immediate help.
``````

Where exactly do I type this? I tried typing 'H' at the end of the sentence but nothing was happening.

If you run tex on the commandline, then by default it stops at an error and gives the question mark prompt to which you can type `h` (for help) or `x` to quit or `s` to scroll through future errors without stopping etc.
Your editor (in common with most other such systems) is running tex in `\scrollmode` where tex doesn't stop on each error and acts as if you had typed `s`. This allows TeX to finish, and the editor to parse the log file and show that display. As TeX scrolls past each error the standard message is still printed to the log, even though interaction is not possible.