if you are on Android install

#Amethyst nostr:nprofile1qqsf3d23f5vqdnkfrem3kmvfq5hf4puwszgfnvurn4syu0s6w53s50cpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtc6uz24k, once you login with your private key (best to use #Amber for that), but if you trust the app, just sign in with your private key. Select your post and click on the three dots, select edit or delete your post

bear in mind that some clients do not support editing and therefore won't show any editions, most of them support deletions. Any good client will support both.

Choosing the right clienf from the start matters, some clients are known for censoring (the irony)