Where do I put .htaccess ??

I have a main domain who files are in the root of my hosted space:
\username\public_html\

I have a subdomain who files are located off the root:
\username\public_html\subdomain

I currently have an 'addon domain' who shares the same files as the
Sub.
\username\public_html\subdomain

I now want to redirect the addon domain to another domain.

So do I place the .htaccess in the root or the sub domain directory ?

I have tried the root and it didn't seem to work !!

Thanks

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