For questions and problems with the CMS core. This board is NOT for any 3rd party modules, addons, PHP scripts or anything NOT distributed with the CMS made simple package itself.
Ideally you would want to find where it is being called in the page template, and either remove or comment out that code. In Content Manager, you should be able to see which template(s) are being used, and edit them from there or in Design Manager. If you are using template inheritance you may need to find the parent template.
From there, it will depend what module, if any, is being used for the blog. It should be fairly obvious, and likely something like News, CGBlog, or LISE. You can comment out using Smarty comment tags e.g. {* code to comment out here *}
If you can't figure it out, you may need to share the site url and/or paste in your template(s) here.