1. Exit: Qingdao North high-speed railway station Exit.

2. Walking: According to the signs or signs, walk to the nearby subway line 3 station. The station of Metro Line 3 is near the subway exit. Just follow the signs.

3. Entrance: To enter the subway platform, you need to go through the security check and credit card system (generally pay by bus card or QR code) to enter the platform area.

4. Get on the train: Wait for the train of Metro Line 3 to arrive at the platform, pay attention to the platform display screen or broadcast prompts, and ensure that the train goes to the desired destination.

These are the steps of taking Metro Line 3 in Qingdao North high-speed railway station for your reference. Please adjust the specific operation according to the actual situation.