How to Change Standard and Time Zone on Edimax BR-6428nS Wireless Router?

I have bought Edimax's 300Mbps BR-6428nS wireless router recently and can't change from B/G/N to N standard. There's no drop-down menu and same is true for changing time zone. Here's what I mean:

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Advanced options:

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The option I have in Data Rate is from 1M to 54M
The option I have in N Data Rate is from MCS0 to MCS15

I have drop-down menu where I choose ready servers to pull time and date from but router does not get updated information, despite me knowing that servers are working. Here's the picture:

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