It wont delete messages from facebook messenger although it says it is deleting but it never does

SOURCE: Yahoo messenger list

This looks to be a problem with Yahoo itself.
Try writing to yahoo technical team.
Link as below.
http://help.yahoo.com/l/us/yahoo/messenger/contactus/contactus-01.html

SOURCE: deleting text messages

Ok, here is what you do to delete your messages in the inbox:

1. First you press your messages button where they are located
2. Now scroll down to where it says Inbox and make sure it is highlighted
3. Next press the button that looks like two pieces of papers one on top of the other...it is next to the OK button in the middle but on the left side.
4. Next you will see something that says Setup...press OK
5. Scroll down to where it says Cleanup press OK and you will see Inbox and Sent Items on there. Choose your Inbox ( you can also do the same for sent items)
6. Now just choose how often or how many messages you want cleaned up...then press the OK button.
7. It will automatically ask you if you want to do this now...choose yes

Now your inbox has fewer or no messages...

Have a blessed Day!

SOURCE: i cant delete texts

that happens to my env all the time.
Just take your battery out and put it back in.

SOURCE: deleted yahoo messenger message archive

Program Files \ Yahoo! \ Messenger \ Profiles...

SOURCE: I cannot delete several of my messenger contacts

Seems Error Code 40402 pops up when trying to remove them while in your Yahoo Instant Messenger list first.

Glitches and Updates!!! Here's a work around though.
You will need to go to your Yahoo Email Account and delete the contact's name there first.
1. Click Contacts from your Email page to open your list of Contacts.
2. Go to the one you wish to remove and check the box next to it.
3. Go to the top of the list and click the Delete button.

Go to Yahoo Instant Messenger, right click the name and select Delete from the drop down menu.