Put your car up on jack stands so the rear wheels are free to spin. After filling with Tran fluid. Run/idle engine and gently shift Trans through the gears. Park, reverse, drive. Let engine idle with the Trans in dive and rear wheels spinning fo 10 to 15 minutes. Then shut car off . Place in park. Check fluid level.
The hot fluid will expand and the excess will flow out. When it stops running out. Replace the fill plug and it's right. If you suspect a leak check in 30 to 60 days.

**FYI. My Trans at 175 000miles. Seems to use about half a qt in 90 to 120 days (10000 miles) with no external leaks that I can find. I don't know where it goes but it just keeps running like new. So I just keep checking it.

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2002 BMW X5 3.0
2006 Ford Explorer 6 cyl
1998 VW Jetta 2.0 GLS
2004 Honda VTX1800C 100hp 97 lb of torque