Ah Jins, I know you will understand when I tell you that it took years on MN for me to post any pic at all and only recently to these guys I had known a year 
You aren't missing anything honest 
It's a bit of a faff the posting a picture malarkey. If you go into MyMumsnet and follow the links you can post pics and make them public, private or mumsnet mates (you have to make a mumsnet mates list there is a link to that also) 