Enclose the text in square brackets. The brackets operate on regular romanized draconic, i.e., "dovahkiin" instead of "dov4k1n" or "dragonborn".

"does it work on english words?"

If you use brackets on English text, you get a simple letter substitution cipher that replaces C with K but is otherwise English with English spelling.

"meaning?"

If someone knows draconic but not English, they will not understand the runes you get by putting brackets around "greetings, I am the Dragonborn". That input text should be given as "drem yol lok, zu'u dovahkiin".

does it work on english words?

i think that i may be able to translate the word 'banned'.

meaning?

sorry i'm kinda computer illiterate when it comes down to actually putting the knowledge into practise.