Unreadable because if you delete posts from a topic it gets illogical

yep but its decent used brings a little bit clarity at the end it is more freedom > advantage

xpadmin should try it and then look how it will be used

if you want to "deleted" your post, click edit then replace everything by "deleted by me"

It depends on the kind of forum engine that is used. The engine from this forum only allows it to delete your own posting as long as there is no reaction on it. As soon as someone reacts on your posting, deleting is not possible anymore. So it's simply not possible within the possibilities of the settings of the forum engine for "normal users" to do this, there is no option for it.
"But", you can argue, "Moderators can delete those postings just fine?". True, but this is how the engine is designed with its rights to users: guests can only read, normal users can start topic, read, write and delete own postings as long as no reaction is given, moderator can do all that and moderate and admin can do (almost) everything.
If for some reason you want a posting deleted, you can give a PM to Xpadmin or me ... or do what laissemoirire suggested.