You cannot clear clogged lines.
At least I do not know how to do this.

If the compressor is running (you can usually hear it but also should be able to feel it vibrating) and you are getting no cooling then you have a sealed system problem and it will be an expensive repair. Often it makes more sense to put the dollars towards a new unit.

I would not let it run very long trying to get the lines to clear as it is costing you money for electricity.