Hi There,
Thanks for writing in.
You cannot edit the source code of an individual pages however you can edit the source code. The pages or post template can be found in the x\framework\views.
Please try also plugin conflict test because some of the infection is generated by your plugin. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
Hope it helps.
Let us know how it goes.
Thanks.