Can I send her a certified letter to her work address if she does not reply to my notice in the divorce?

The language in the decree controls. If the decree states "email" for communication then you are covered.

How do I go about changing the father on my sons birth certificate?

This gets a bit complicated. On this set of facts your husband is the legal father of the child. At this point you will have to have a Court sort...

Is this in a divorce scenario? Is there an attorney involved?

Can I sue Pizza Hut for providing coupons/ sponsor through three winners and then not getting the coupon listed on the site?

Does the coupon indicate something like "participating franchises only"? If so then it might be as simple as figuring out the participating store....

What if you do not know where your husband is?

What do you want done? Divorce? Pay spousal or child support? Declare him dead?

Can the children visit with me anytime I am in town?

The operative word in the phrase you have posted is "may". As opposed to "shall". It would be best to consult with an attorney before proceeding.

My daughter's father wants me to take him off child support I really do not want to. Need answers!

If you accepted state benefits then there is nothing you can do to "take him off". The State will pursue this with or without your blessing. Are...

Do I need to seek advice?

Were you a patient there? If so, YOU NEED TO BE TESTED!!! Then worry about seeking advice. Go to your own doc if need be but go get tested.

Most likely there is no lawsuit and no process server. Most likely there is a shady outfit that bought some old debt, trying out a scheme to scare...

What are the requirements for someone to adopt me?

The person would hire an attorney to file the adoption in court.