To quote on Alibaba, you can follow the steps below:

1. Log in to Alibaba: Open Alibaba and log in with your account and password.

2. Enter the product page: Enter the product keyword you want to quote in the search bar on the homepage and click the search button. Select the product you want to quote and click to enter the product page.

3. Click the "Quote" button: In the upper right corner of the product page, you can find a "Quote" button. Click this button to enter the quotation page.

4. Fill in the quotation information: On the quotation page, you need to fill in the following information:

- Quotation unit price: Fill in your product unit price.

- Quotation quantity: Fill in your product quantity.

- Quotation validity period: Fill in your quotation validity period.

- Currency: Select your quotation currency.

- Delivery location: Fill in your product delivery location.

- Payment method: Select the payment method you accept.

- Other supplements: You can fill in other supplementary information or requirements.

5. Submit the quotation: After filling in the quotation information, click the "Submit Quotation" button at the bottom of the page to confirm your quotation.

Please note that the specific steps of the quotation may change due to the update of the Alibaba website. It is recommended that you read the relevant guidelines and help documents provided by the platform before making a quotation to ensure that the quotation is filled in and submitted correctly. In addition, depending on the specific situation, you may need to further communicate and negotiate with the buyer to reach a final transaction agreement.