Basicly my domain now redirects to a new domain (with a new sever, databse etc), but I want to login to the dashboard of the old domain so I can build the new site
]]>I would undo the redirect, leave the old site alone and install a fresh install of WP on the new domain. Build the site and when you are happy, use the Duplicator plugin to move the newly created site to its final destination.
You could build a site locally, but I usually don’t recommend that for non developers, as setting that up correctly can become complicated.
Hope that helps!
]]>Thanks.
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