How to check the value of a specific bit in vhdl

NINA wrote:
> how should i do it?
with a comparison or a comparator

NINA wrote:
> i need to check the first bit of a
> signle after that the second bit

First of all, make yourself more familar with the ideas behind VHDL. 
Checking a bit of a vector is absolutely basic.

if (signle[0]=='1')...
if (signle[1]=='1')...

Depending on what should be done, this could be a use case for a for 
loop:

1

for i in 0 to signle'high loop/generate

2

    if signle(i) = '1' then

3

        ...

4

    end if;

5

end loop/generate

I hope there is no syntax error, but the idea should be clear.