Ads get deleted by moderators when they are out of compliance. Don't take it personally if this happens. Please read the guidelines and post within guidelines.
If your ad is deleted, you are likely to receive a copy of your deleted ad. You may copy/paste the ad back onto the classifieds, while adding in the missing detail. (assuming the reason it was deleted was due to an omitted, but required clearance)
To copy/paste, click your cursor on and drag over the desired text. Right click and select "copy". Then go to your new post, in the body of the ad, right click and select "paste".
Then you may add in the missing detail.