1) BB, leave default.
2) two EMA: one at 8, one at 16
3) select 15min
Why? GB works with 15min candlesticks. EMA is set to 2 and 4 hours, so 2*4=8 and 4*4min=16 (because there are 4*15min in 1 hour).
We all (all traders on all markets, not only for crytpos) use BB with this default settings. So, no needs to change this.