Coffee too less for Frenchpress I am new to frenchpress coffee and love the rich flavour of coffee it makes. However I am not sure if I am doing it right. The coffee beans I had grinder packet says 7g of coffee in 180ml of water. 

When done properly, it makes less than a quarter of a standard mug. 
Is it ok for me too add more grams of coffee with additional water to equal amounts? 

How would I know if this is too much strong and can be dangerous because the more grams I put in the more stronger it get. Plus 7g and 180 ml of water won’t let me push down the bat of frenchpress as it’s so low water so it is already on bottom.
The instructions have poor wording, instead use 7g PER 180ml of water, and make as many cups as you like / your french press can hold.

Personally I use an 8 cup french press, I use roughly 50g of coffee, and fill with water high enough to be full when in full bloom (about 30 seconds after you add water and the coffee is expanding, and letting off c02) After about 45 seconds, I give it a quick stir, and top the french press up with about another ounce or so of water and cover for 4 minutes.

The ratio of coffee per water is a suggestion ONLY.  Typically I recommend 8-9g per 120g of water (If I recall, SCAA standard is 9g per 120g water?)  Use it as a starting place, and adjust based on your taste, and how much coffee you want to brew.

Just a note, I go lighter than my suggested ratios in a french press because it brews stronger.  The 8-9g works well with a drip brewer.

Oh.. one other thing!  You are going to have a hard time making dangerous coffee, unless you consider tasting bad dangerous, so don't worry about it being a risk if you are adding too much coffee.  If you stick to the rough suggestions in this post, and other comments on this thread, you are going to get in the ballpark of where you are wanting to go, and then you just fine tune to your personal preference.  And if you manage to make truly dangerous coffee.. make sure to repost the recipe.. I think I could use some of that right about now!!