You can increase memory_limit on your server in several ways (back up any files you edit to be able to restore them):

1. Try adding this line to your wp-config.php file:

define('WP_MEMORY_LIMIT', '128M');

2. If you have access to your PHP.ini file, change the line in PHP.ini

If your line shows 32M, change it to 128M:

memory_limit = 128M ; Maximum amount of memory a script may consume (128MB)

3. If you don't have access to PHP.ini try adding this to an .htaccess file:

php_value memory_limit 128M

4. If all the methods mentioned above do not help, create a file called "php.ini" in the "wp-admin" folder of wordpress install.

Add the following text to the file;

memory_limit = 256M ;

5. Contact your hosting provider.