Amazon off-site promotion means showing your products to potential customers through other channels outside the Amazon platform and guiding them to enter your store for purchase.

Here are the steps to set up Amazon off-site promotion:

1. Log in to Seller Center: First log in to your Seller Center account.

2. Create a new advertising plan: Select the "Advertisement" tab and click "Create New Plan".

3. Select products or goals to promote: Select specific products or entire brands to promote as needed, and determine parameters such as the required budget and delivery time.

4. Select off-site channels: Select one or more off-site channels (such as Google, Facebook, etc.) from the available options, and follow the prompts to complete the relevant settings.

5. Set bidding strategies: In order to ensure the best results, you can set different bidding strategies to deal with different situations. For example, increase bids during certain periods to attract more traffic, etc.

6. Launch and monitor the campaign: After launching the campaign, keep a close eye on its performance and make adjustments and optimizations as needed. You can use analytical tools to track data such as conversion rate and click-through rate, and improve your marketing strategy accordingly.

In short, when setting up Amazon off-site promotion, be sure to carefully consider each step and follow best practices to ensure good results.