Be aware that Ad-blockers and other software might block the miner from starting, so you would have to disable those for it to start. Also note that running the miner on a high level is CPU intensive and will slow your computer down.
About AetherHub NRG
Mined: This is the total energy that has been rewarded for mining. This counts all users
Reservoir: When users spend energy it is returned to the AetherHub Reservoir pool where it can be issued to users by rewards or other bonus programs. When mining 70% of the reward goes to the user while 30% goes to the Reservoir, this is in balance with the Coinhive payout for mining. NRG never dissapears from the system, it is created by purchasing functions or generated by mining. However NRG in the Reservoir is not in circulation and gives us the option to balance the economy by keeping them there if necessary.