Adding images in the resources is very easy. Go through the following steps:
1. Finish your resource and submit it.
2. Come back to the resource and click on Add attachments.
3. Then click 'Add new attachment'. You would get the upload image tab, where you can write the name of the image, upload from the files from your hard drive and say Submit attachment. Don't forget to click on 'Do not show this attachment as a link..'. Then say Submit attachment.
4. You will find the image you wished to add in your resource uploaded as an attachment.
5. Now go back to your resource and click Edit.
6. The just copy paste the image link wherever you wish to add the image. Even in the middle of a resource, you can do it.
Please note: Do not add too many images in the resource. Just one or two which you think would be appropriate for the resource.