To become a taxi driver in Lithuania as a foreigner, you will need to follow these steps:

1. Obtain a Lithuanian driving license: You will need a valid Lithuanian driving license to work as a taxi driver in Lithuania. If you have a driving license from your home country, you can use it for up to six months after arriving in Lithuania. After that, you will need to obtain a Lithuanian driving license. To obtain a Lithuanian driving license, you will need to pass a driving test and meet other requirements.
2. Register as a self-employed individual: To work as a taxi driver in Lithuania, you will need to register as a self-employed individual. You can do this by visiting the local tax office or by registering online. You will need to provide your personal information, including your name, address, and contact details.
3. Obtain a taxi driver’s license: In Lithuania, you need to have a specific license to work as a taxi driver. To obtain this license, you will need to pass an exam that tests your knowledge of the rules and regulations governing taxi services in Lithuania. You can find more information about the exam and how to prepare for it on the website of the Lithuanian Ministry of Transport and Communications.
4. Obtain a taxi vehicle: To work as a taxi driver, you will need a taxi vehicle that meets the requirements set by the Lithuanian authorities. These requirements include having a meter installed in the car, having a taxi sign on the roof of the car, and having a special license plate. You can either purchase or lease a taxi vehicle.
5. Join a taxi company or work independently: You can work as a taxi driver in Lithuania either by joining a taxi company or by working independently. If you decide to work independently, you will need to find your own customers and manage your own business. If you decide to join a taxi company, you will work for the company and receive a salary.

It’s also important to note that the rules and regulations governing taxi services in Lithuania can change, so it’s a good idea to check with the Lithuanian authorities or a local taxi company for the latest information.