You need to edit theme files and change it there. I check for theme demo but its preview and files not available for us. Means you have to hire someone to do this or you can ask theme support.
Want to modify or custom changes on store hire me. My Email: firstname.lastname@example.org Skype: navrocks1 If helpful then please Like and Accept Solution. If you are happy and want to donate small Click here (Its my paypal)