If you need to register a trademark for opening a store on AliExpress, you can do it in the following ways:

1. **Self-registration**: If you have the conditions, you can directly apply to register a domestic or overseas brand trademark. When registering a trademark, you need to pay attention to choosing a trademark that contains English, and make sure that the trademark name is easy to remember and read, and has positive energy, and avoid duplication or similarity with well-known brands.

2. **Authorized trademark**: If you are eager to open a store on AliExpress, you can consider using the trademark through trademark authorization first. Trademark authorization is usually initiated by the trademark holder and is authorized to the seller through agents at all levels. This method can save time and allow you to start operating a store faster.

3. **Professional service provider**: If you are not familiar with the trademark registration process or want to save time, you can find a professional intellectual property service provider to help you complete the trademark registration. They can provide one-stop services, including trademark registration, agency accounting, etc., and provide the most suitable solution according to your specific situation.

In short, no matter which method you choose, you need to ensure that you have the legal right to use the trademark in order to successfully open a store on the AliExpress platform. The process of registering a trademark may take a certain period of time. If you choose to register by yourself, you will usually get the registration acceptance notice in about 2 months, and the complete trademark registration certificate (R mark) may take 7-12 months. Therefore, it is recommended that you plan ahead and leave enough time to complete the trademark registration.