Some agents you add on the portal would not be completely involved in your helpdesk workflow and they are called 'occasional agents.' An occasional agent is distinguished by the day pass which is the token that allows you to login to the portal. The price of a day pass varies according to the plans: $2 for Blossom, $3 for Garden, $5 for Estate and $11 for Forest. Please navigate to the Admin > Account Settings > Day pass to purchase these passes. 

An important note on this would be that only an Account Administrator who has the 'Account Settings' panel would be able to perform this action.