The phrase "to place the blocks" means to arrange or put the blocks in a certain order or position. It implies organizing or setting things up in a desired way. Full definition
Ask your school's computer network administrator if he / she has placed blocks on allowing teachers to download files onto the school's computer system. (uniqueteachingresources.com)
By placing the blocks in a few of the compartments, you increase the degree of difficulty. (topdogtips.com)
If that's not doable, place a block under the front thigh, so the hamstring rests against it in a supported split. (health.com)