As MageStack uses Nginx as the web server, you need to add the following rewrite rules to your respective domain's general rules.
Eg. For example.com
/microcloud/domains/example/domains/example.com/___general/example.com.confWith the following file contents
location /wordpress {try_files $uri $uri/ @wordpress;}
location @wordpress {
rewrite . /wordpress/index.php last;
}Adjust wordpress to suit the name and location of your WordPress installation.