How to decrypt SSL on OS X

Hi, I'm trying to learn how to monitor what's going on on my home network (cellphones, computers). Up to now, I was able to capture data in monitor mode, and I managed to decrypt 802.11 packets with my wifi keys provided to Wireshark and the complete capture of the Eapol handshake. (I'm a beginner btw.) Next step, I want to be able to decrypt SSL, since I'm certainly far from having a complete picture of my network's traffic without this figured out. I'd like to be able to decrypt what's going on my computer, but on the other devices' too. I tried the technique with the SSLKEYLOGFILE variable linking, but can't seem to be able to make that happen. Here's exactly what I did, thanks for helping me understand what I'm doing wrong:

• I type the following command in my Terminal: export SSLKEYLOGFILE=/Users/heresmyusername/sslkeylogs/output.log
• followed by: open -a "Google Chrome"
• followed by: wireshark
• then I open in Wireshark the capture file I want to decrypt
• and in preferences --> protocole --> SSL: I type the following in the pre-master-secret field: Users/heresmyusername/sslkeylogs/output.log and apply this configuration
• and major failure.....

My guess is that I make a syntax mistake..?

Thanks for your help!!