Newsletter sign up page not on landing page HELOP

I’ve contacted Klaviyo support but the link they sent wont allow me to create a stand alone page for newsletter sign up and have searched through this feed too and although it is helpful its doesnt allow me to do exactly what I want.

I’ve created a page on shopify which I want to have a nicely designed sign up. The reason I want to create on a stand alone is to link of IG and Facebook stories

It seems that you have to adjust the code of your shopify site if you want to to this, but I have no idea where to add this, I’ve looked at the <> at the top of my shopify page but I would even know where to add it, where to find it when I go into ‘edit code’ section within my theme

<div class="CodeSnippet__CodeArea-sc-1117omd-0 EbDiW EmbedCode__StyledCodeSnippet-sc-qkf27p-1 jLPHuS" style="text-align: center;"></div>
<div class="CodeSnippet__CodeArea-sc-1117omd-0 EbDiW EmbedCode__StyledCodeSnippet-sc-qkf27p-1 jLPHuS" style="text-align: center;"></div>
<div class="CodeSnippet__CodeArea-sc-1117omd-0 EbDiW EmbedCode__StyledCodeSnippet-sc-qkf27p-1 jLPHuS" style="text-align: center;"></div>
<div class="CodeSnippet__CodeArea-sc-1117omd-0 EbDiW EmbedCode__StyledCodeSnippet-sc-qkf27p-1 jLPHuS" style="text-align: center;"></div>
<div class="CodeSnippet__CodeArea-sc-1117omd-0 EbDiW EmbedCode__StyledCodeSnippet-sc-qkf27p-1 jLPHuS" style="text-align: center;">
<div class="CodeSnippet__CodeArea-sc-1117omd-0 EbDiW"><div class="klaviyo-form-W4zdTQ"&gt;&lt;/div&gt;</div>
</div>

the other alternative looks like creating a sign up via the

Lists & Segments > Newsletter > Subscribe and Preferences > Subscribe

the problem with this is, its hugely uninspiring sign up and Id like to use the design I have in my sign up forms, it doesnt look like you can change this or am I wrong?

Any assistance would be very much appreciated as it looks like this is something that other people have come up against. Many thanks in advance