Lazada is a popular e-commerce platform in Southeast Asia, including Thailand. The Lazada Seller Center is the online marketplace where sellers can register and manage their businesses on the platform. Here are some steps to register as a seller on Lazada:

1. Go to lazada.com.my/sellercenter
2. Click on "Register" or "Sign Up"
3. Fill out the registration form with your personal information, such as name, address, phone number, email address, and payment details
4. Choose your preferred seller category, such as electronics, fashion, home appliances, etc.
5. Upload any relevant documents, such as tax invoices, product photos, and other supporting materials
6. Verify your identity by providing a government-issued ID or passport
7. Wait for Lazada to review your application and approve your account
8. Once approved, you can start selling products on the Lazada platform and manage your orders and inventory through the Seller Center.