Get a removable disposable pen tube (keep it and use it later if you want for writing)  and put a small piece of scotch tape  around it to pick up the aphids. 

They will stick to the scotch tape and this works if you don't have many insects of this type. 

If you have many insects, you need to dedicate more time. The other trick is that you have to check the carnivorous plant every day for aphids untill you get rid of them.