投稿 とうこう
tōkō

Noun
Suru Verb

1. contribution (to a newspaper, magazine, etc.); submission; post (on a blog, social media, etc.)

Transitive
わすれないでこの手紙 てがみ投稿 とうこうしなさい。
wasurenaide kono tegamio tōkō shinasai.
Don't forget to post this letter.