By default ADCM start on port 8000, so you just have to now ip adress of server with installed ADCM to start using it.
Open you browser and go to http://<ip_of_your_server>:8000
Default user is admin and password admin.
To continue consider to upload some of infrostructure bundles. Go to store.arenadata.io and download some of them.
Then click a “BUNDLES” in head menu of ADCM and upload bundles with “Upload bunle” button.