pankaj83 Hi
1) You may try the following to get the result as envisaged:
1) Creating new module position -- You can kindly refer to this documentation for creating new module position - below_footer
2) Custom module creation -- Assign custom module alongwith adding the banner to new position named below_footer
3) CSS -- Thereon, You may require to add some CSS rule-sets in order to position the module properly and get the appropriate rendering
Tips provided here also could be of help:
https://member.joomlart.com/forums/d/1136-can-i-add-extra-search-fields-in-ja-teline-v/35
The code for adding new position can be added in /templates/ja_megastore/tpls/blocks/footer.php file around line 74 below :
</section>
Note: Would suggest to take backup of your site or current file before performing aforesaid steps, in case rollback required whilst facing any issues e.t.c
