The management of the Mega Menu has changed width the plugin Ja_Extended.
Before it was necessary to use the following syntaxes :

Now, Everything takes place in the management of the links of menus at the level of the parameters Parameters (JA Extended).
1- First Level of the Mega Menu links :

It is here that we are going to inform the number of columns.
To show a slogan, we are yes going to put " show the title ", then we shall inform the description.
2- Second Level of the Mega Menu links - title of the column :

You have to select groupe = Yes
3- Second Level of the Mega Menu links - links of submenus :

You have to put columns=Y and group=No
4- Insert a module into the menu :

To insert a module in a column, you must select Group=Yes and Submenu Content=Modules then select the module.
5 - Insert a module position into the menu :












