If you are unsure about the difference between Admins and Ministry Leaders, check out this article.
For Admins: Admins need to download the program onto their computer. They can download MSP here. They will use your church's activation code and password to sign into the program once they have downloaded.
For Ministry Leaders*: They do not need to download the program, as they access all their privileges through the Web Terminal (accessed through any internet browser). To assign Ministry Leaders and give them leadership abilities in the Web Terminal, you must go to the Web Terminal pane on the left side of MSP, click the "Web Terminal settings..." button and go to the Ministry Leaders section in the dialog that appears. From this section, you will be able to click the "Declare leader..." button to choose which volunteers will be Ministry Leaders and then assign them to the appropriate ministries, services, and responsibilities.
*For licenses purchased after December 2015, Ministry Leaders are only available in the Plus Edition of MSP.
Once you have set up your Ministry Leaders, you can send them an introductory email using the Announcementspane. Go to the Announcements pane on the left side of the program, click on the "Use template" tab at the top of the page, select "Preconfigured" and then select "Introductory email - for leaders." This will load an email that is meant to introduce Ministry Leaders to MSP. It includes a link to the Web Terminal, their username and password, and a link to a video tutorial meant to familiarize Ministry Leaders with the software. You can customize this email as much as you wish - the template is just meant to be a jumping off point for you!
You can also adjust the "To" field at the top of the page to send to only Ministry Leaders, by selecting the "But only volunteers who pass | this filter..." box. Then, in the window that appears, click "Ministry leader". In the box that appears on the right, it should say "Are a ministry leader". Click "OK" and then you can go ahead and send your email to get your Ministry Leaders on board.