2 things!
1. BF has an edit button to correct any spelling errors or problem, its to avoid double posting
2. Your problem is easy to solve:
-Go to Object Editor
-Select Unit tab
-Find the unit you want
-Find Stats - Stock Replenish Interval and Stats, Stats - Stock Starting Delay, and Stats - Maximum Stock
What each does? Starting Delay will determine when you can start collecting this unit/hero (eg. 10 is 10 seconds until you can collect this hero). Interval will determine how long the stock will replenish (eg. 4 will replenish 1 unit every for second). Finally, Maximum Stock determines how many units, item or heroes can be obtained from that location (eg. 1 means only 1 unit can be obtained before it needs to be restocked).