I have RB1100AHx4,I installed new 128GB SSD in.Please help me how I enable web proxy on SSD drive.

You need to first format the drive, (System > Disks), then set the folder is it mounted on on IP > Web Proxy (last parameter field, Cache Path).

For temporary basis my main router is RB2011 and RB1100AHx4 connected as a bridge with RB2011. I format HDD and enable proxy but that is not working.

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Have a look at https://wiki.mikrotik.com/wiki/Manual:I ... on_example

Bear in mind is it not possible to transparently proxying https traffic, which accounts for the majority of web traffic nowadays.

Don't forget , the proxy on mikrotik it is not compiled to use multi core....
So if you use proxy the performance is very poor.

Regards