Google Tag Manager Application

Need some help on how to insert my code of GTM... It returns an error at my end. I pasted the code on tpl using an HTML Editor. My question is that... Is the plugin available here as an addon still works?
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Need some help on how to insert my code of GTM... It returns an error at my end. I pasted the code on tpl using an HTML Editor. My question is that... Is the plugin available here as an addon still works?
Comments
Use pocket plugin instead
Yeah, but there are two snippets. Should I separate it or not necessary?
Not necessary
Thank you for your time...