I can't edit my comment or I can't see how too 
As a "New member" it may be different to "Member" or "Active member" status that some forum members have now achieved.Ya it was right away I tried to edit
Looks like its an admin setting
Its a 5 min time limit it is there to correct errors.I dont YET as have to post more crapas time limit might have been under 20 mins and i was able to edit it once and added to my post but second time edit failed. Only 3 dots i might have be on dirty laptop screen or glasses and not seeing stars yet.
Ah okay as another forum in Ireland gives you 24 hours to edit it as i have just added an extra post so no big deal then as thought it was me again.Its a 5 min time limit it is there to correct errors.
The reason it just 5 mins is to stop the content of the post been permanently deleted. It happens folk get the hump and go a delete info they made in posts.