In JCVGantt
Select any task
and open up the Properties Dialog
Go to the Resource
tab, and double click on the top row of the Name column and a combo
box list of resources will appear.

Select the appropriate resource. Click OK when done.
In MindManager X5
Open the Task Info
Pane, select any topic/task. Enter the name of the resource you want to
assign to this topic
Useful Tip: It's easier to add resources in MindManager X5,
but more prone to misspelling errors.
It's slower to add resources in JCVGantt,
but safer in terms of typing errors.
Pick the style of entry most suitable to your work