Go to the joomla database and enter the following SQL command: (usually you can access the database through PhPMyAdmin)
Code: Select all
ALTER TABLE JOS_WEBLINKS MODIFY DESCRIPTION MEDIUMTEXT
The default field type was varchar (250) so it had a restriction of 250 characters.
Your table name might not be JOS_WEBLINKS depending on how you set up the prefixes.
Also this is only used on Joomla 1.013, I can not guarantee it will work on other versions.
Cheers!