Can you walk in to a Juvenal Court in Oregon and speak with a judge?

Generally no, especially if you have a case before that judge. You might want to look into the Family Law Self Help Center.

It is possible that you could move to amend the custody agreement, depending on what has changed since the agreement was reached.

Restraining order

Your boyfriend should contact an attorney to see if he can qualify for a restraining order.

Is there any way to keep my son’s father’a girlfriend away from my son during his visitations?

The easiest thing to do might be to talk to your child's father's mother and ask if she can intervene on your behalf.

Can a 14 year old decide which parent they want to live with?

A judge can consider your child's wishes in a custody proceeding, but the child's wishes might not, by themselves, create a change in circumstances.

Can you use screenshots of text messages in court as evidence?

If there is a custody dispute, you should definitely contact an attorney in either case. It can be very tricky to get text messages admitted as...

How much do I need to pay?

You should contact a lawyer to review your specific agreement. It may depend on whether it is part of child support or alimony.

Can my ex get more child support if she requested less than the state allowance in the original divorce decree?

A court is generally supposed to stick to the guidelines when it makes a ruling on child custody. If there have been significant changes, then you...

Can my exs girlfriend sign legal documents concerning my children?

The person who has custody over a child gets to make decisions concerning the child. If you don't have custody, but want it, you need to seek to...

Can I move out of my parent's place to live with my fiance, with my almost four-month-old son?

The major issue with this doesn't seem to be child custody, and the answer to your question may be found in another area of family law, so I've...