Try one of the following (there are different versions)...
Option 1...
1. Go to "Settings" and tap "About Phone".
2. Next tap "Status".
3. Scroll down and locate the WiFi MAC Address.
Option 2...
1. Go to "Settings" and tap "About Phone".
2. Next tap "Hardware Information".
3. Scroll down and locate the WiFi MAC Address.
Option 3...
1. Go to "Settings" and tap "About Phone".
2. Next tap "Wireless and Network".
3. Tap "WiFi Settings".
4. Location the "Advanced" section and you will find the WiFi MAC Address there.