Can you post our banners in mylot???

You can only post affiliate links and banners in your profile. A lot of people post links in the discussions, but if someone reports them the discussion will be removed. I do believe you can post a link to your personal web site or blog in the discussion. Your best bet would be to read the guidelines of myLot to answer this question and know for sure.

At discussions or responses I'm sure we can't add our banner now I think I saw few at profiles,if I remember good.I never cared to add so I'm not so sure how they did.If you gonna not see here as response you can ask if you find any member's profile.

I do not think this is possible. What you can do is post an image of the banner and then post a link of your referral link to the website you are referring to.