There are currently two ways to mine a single coin in Hash Auger. If you uncheck the Auto Switch GPUs setting on the Mine tab, you can use the lists in the GPU Coin area to select a pool and an algorithm/coin. The software will then mine only the selected algorithm/coin on all GPUs. Most auto-exchange pools do not allow a specific coin to be mined except for Zergpool using the MC parameter. But you can mine specific coins on the pools that do not auto-exchange.
Using the Pause Switching button, you can also keep mining the current algorithm/coin. The software will not switch from the current work until you resume switching by pressing that button again.
sorry
but in that way can choose only the algo
not the coin/coins
for example i want to mine x16r algo and coin rvn.
can select only x16 r but not the rvn
Which pool are you trying to use? Most auto-exchange pools such as Blazepool will not allow users to mine specific coins whether they are using HashAuger or something else. However, HashAuger also supports a number of pools that do not auto-exchange. For example, yiimp.eu offers Raven. If you add a wallet for your raven address in HA and assign it to yiimp, you will be able to mine Raven coin on that pool.