On the next screen, you should see a list of the Mojang games registered to your account. Find the Minecraft row in this list, then find your username to the right. Click Change next to your username to proceed.
Parallel thinking is defined as a thinking process where focus is split in specific directions. When done in a group it effectively avoids the consequences of the adversarial approach (as used in courts). In adversarial debate, the objective is to prove or disprove statements put forward by the parties (normally two).
It can be argued that the neurons are such processors, but that is not what cognitive scientists mean when they say the brain is a 'parallel system'. They think on more complex processors, with more capabilities than a single neuron has. However, this kind of processors does not exist in the brain. The main thinking part of the brain is the cerebral cortex, and in the cortex there are no separate units at all. Every region in the cortex has direct connections (i.e. sends axons and receives axons) to all its neighbors, and in many cases to further regions.