See this question here:
https://www.houzz.com/discussions/can-i-remove-photos-from-an-ideabook-dsvw-vd~19609

I am not getting an edit button under the idea book name, also not able to start a new idea book.

If you click on "My Houzz" at the top of the page, you will see a list of all of your ideabooks.
Next, click on the title of ideabook you would like to edit.
This will get you to your ideabook page (e.g. http://www.houzz.com/ideabooks/164570/list/evans41-s-Favorites)
Once you are in the ideabook page, you will see the facebook/twitter share button right under the ideabook's title. Under the share buttons there is an "Edit Ideabook" button. Click on that button to get to the edit ideabook form.
In the edit ideabook form, click on the "X" button next to the photo you would like to remove.
Then, scroll to the bottom and click on the "Submit" button.

To create a new ideabook, see the question here:
https://www.houzz.com/discussions/how-can-i-make-more-than-one-ideabook-i-dsvw-vd~19150

Thanks for the help, was trying to make changes in the app not the website.

Thanks.. :)