The welcome message is the membership itself. Save it, star it in WhatsApp or keep the email: it holds the login, the links and the date on which it all stops.
User and Pass. Your username and password, both case-sensitive. Phone keyboards like to start with a capital letter; switch that off before typing, or the player will refuse the login.
Portal URL. The server address, shaped like http://your-server:port; copy the colon and the port number too. Username, password and this address are the three parts of an Xtream Codes login, the first choice in most players.
M3U playlist. One long link that lists every channel and title. Use it in players without an Xtream login screen: VLC, Kodi through its add-on, or Smart IPTV.
Guide data (EPG). The XMLTV address of the 7-day guide. An Xtream login fetches it by itself; with the M3U link, paste it into the player’s guide setting.
Membership ends. The last day of your plan, written in full. Nothing is charged on that date; the login simply stops working.