Hello @mariam3 Yes, you can edit any post you publish. Just click on the three dots under your post "...", next to the box with the arrow inside; then click Edit

Location of the EDIT feature:

It's imperative that you edit this post as soon as possible.

If the images you used are not from a site that gives you permission to use them, then you will have to find another image and provide the source where you found it.

Once you find a free image, use this example to document the source as @angielb described to you in another comment:

[Image Source](direct link to image)