My writingon texte/mon entrée de journal

Here is how you can say it in French

Bonjour, moin nom isest merle.

moi = me
my = mon, ma

is = est

Moi ecriture en Ffrançaise écrit est tehorrible.

If you say "mon écriture est horrible", you're referring to your way of forming letters
We'd literally say "my written French"

Language names aren't capitalized

"terrible" can also mean "great" according to the level of colloquialism and the situation (like "awesome"), so I'd pick "horrible", which would be more natural in this situation

J'aimeraise de l'aide.