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how to measure voltage across a resistor with AC input?? thnks

The Voltmeter and ammeter circuits on their own:

only work with a DC simulation as in:

Simulate > DC > Run DC Solver.

To plot voltage across any component with an AC signal source either in a Time Domain or Frequency Domain simulation, read:

https://www.circuitlab.com/docs/the-basics/#nodes

then:

https://www.circuitlab.com/docs/the-basics/#named_nodes

then:

https://www.circuitlab.com/docs/the-basics/#plotting_outputs

and then:

https://www.circuitlab.com/docs/expressions/

There are many public examples of these techniques.

See also:

thanks, i didn't know it is possible to use the expression in plotting the signal, thanks for sharing the links, very informative, :D