Yes, you may elect to give others access to the User Name and Log in Password for your account.  

2 How can I change my password?

Use the Contact Us whenever you request a change of password.  

3 Will this software relieve the need to conduct inventory counts?

The Cut Sheets generated will Maximize material usage and produce a list of material and sizes you can expect to have in you inventory for the next job and show what is going into scrap. Human error and rare flaws in materials make it impractical to depend on software alone for inventory. There's no substitute for taking inventory in the shop on a regular basis.