Hi, I am currently working on a project and decided to pick up Photoshop again, having used it frequently in the past. However, I cannot seem to use any tools to affect my work, as in I cannot draw, use the lasso tool or anything that requires these tools. I have tried everything I can think of to be able to affect it, but I don't seem to be getting anywhere

I know i'm missing something simple, can anyone help?

Thanks

Lath