# Using Libautech Smart Upsell with custom page builders (Shopify)
If you’re using a custom page builder, you can still show Libautech Smart Upsell offers by adding a few simple hooks.
## Step 1 — Enable the app embed
- In Shopify Admin: Online Store → Themes → Customize
- Go to App embeds
- Toggle on “Libautech Smart Upsell”
- Save
## Placement targets by upsell type
### Frequently Bought Together (rendered after target)
Place this marker where you want FBT to appear afterwards:
```html
<div class="lbtu-fbt-block-target"></div>
```
### Product Addons (rendered after target)
Place this marker where you want Product Addons to appear afterwards:
```html
<div class="lbtu-pa-block-target"></div>
```
### Volume Discount & Bundles (rendered before target)
Place this marker; the widget will appear before it:
```html
<div class="lbtu-vd-b-block-target"></div>
```
### Popups (Checkout button hook)
Add this class to every checkout button (cart page, cart drawer, sticky bars, etc.):
- Class: `.cart--button-checkout`
Example:
```html
<button class="<other classes...> cart--button-checkout">Checkout</button>
```
## Notes
- Ensure the class names match exactly.
- If your builder loads sections via AJAX (e.g., cart drawer), make sure the elements and classes exist in the final rendered DOM.
## Need help?
If you encounter any issues or need custom work or further help, be sure to reach us at support@libautech.com.
