my photo

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Hello, I have been here since yesterday and I like it here. However, I am a little bit lost when it comes to the functionality of this site. How can I upload my photo, so you can see me next to my posts? Is it this section "add image" below "start a new discussion on myLot"? Do I have to upload the photos every time I post? I saw I can attach photos in "photos" section, but how to use it as my profile photo? And one more thing, how can I add my websites addresses to my posts? I saw some posts with links to the websites. Is it possible and a "lawful practice"?