how to add an image, to a discussion i want to respond .

When you reach 500 rating you can do that. when you response you will see link said "add an image" there you go.. you can add subject,details and tag for that images then uploaded. after that, write your response it will show your response and images you uploaded.

Uploading photos to discussions are actions permitted only to members with 500+ number of postings. This was one of myLot improvements in order to stimulate members to be active and qualitative in terms of postings. So keep up the good work and you'll eventually get to upload photos within discussions.