Step 1 Copy all the required files to the following directories

admin/controller/module/onwebchat.php → "opencart folder"/admin/controller/module
admin/language/english/module/onwebchat.php → "opencart folder"/admin/language/"language you are using"/module/
admin/view/template/module/onwebchat.tpl → "opencart folder"/admin/view/template/module/

catalog/controller/module/onwebchat.php → "opecart folder"/catalog/controller/module/
catalog/view/theme/default/template/module/onwebchat.tpl → "opencart folder"/catalog/view/theme/"theme you are using"/template/module/
catalog/language/english/module/onwebchat.php → "opecart folder"/catalog/language/module/

Step 2 From OpenCart admin panel, choose Extensions → Modules

Step 3 Find onWebChat - Live Chat & click the Install icon (plus icon). Then click the Edit icon to configure the extension

Step 4 Paste your Chat ID, select Enable for Status and then click Save.

If you don't have an onWebChat Chat ID, please create an account here.

Step 5 Navigate to the 'Design' → 'Layouts' section of your admin panel to configure onWebChat Live Chat in your website layouts (e.g. Home, categories, products..). You should do it for all layouts in order to show the live chat widget on all your webpages. Click the Edit icon of the layout.

Step 6 Click the add button (plus). Select onWebChat - Live Chat from the Module dropdown and Content Bottom for Position.

Once you have saved your changes, you should see onWebChat - Live Chat widget on your OpenCart store.