Synaptic Package Manger not working

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http://www.ubuntux.org – Hey I'm new to ubuntu and being so excited, I think I may have messed up computer while tweaking on it. When I go to my synaptic package manager, this window pops up: An error occured. The following details are provided: E: Type 'rem@Tabby-UBU:~$' is not known on line 50 in source list /etc/apt/sources.list E: The list of sources could not be read. Go to the repository dialog to correct the problem. E: _cache->open() failed, please report. When I go to my Add/Remove, this window pops up: Failed to check for installed and available applications This is a major failure of your software management system. Please check for broken packages with synaptic, check the file permissions and correctness of the file '/etc/apt/sources.list' and reload the software information with: 'sudo apt-get update' and 'sudo apt-get install -f'. Can someone please help me fix this step by step. PLEASE :( Thanks in advance!! (Distributions)