If you are on a per-user plan then you can increase your licenses any time on a pro-rata basis by following the given steps;
1. Log-in to your panel from https://dash.intueri.io and then go to Billing
2. Click on the change plan button given on the right side.
3. Click on "Renew subscription" link given on the top.
4. Scroll down to "Add more licenses" section and enter the total number of desired licenes.
If you have enough balance in your wallet then the licenses will be added instantly or otherwise, it will ask you to add funds in the wallet first.
Once the funds are added to the wallet you can follow the same steps to add more licenses.
Please Note: you will be charged on pro-rata basis for the remaining period of your current subscription.