The font makes the text look almost digital. Added to the static monitor screen in the background, the audience can infer that this film will have something to do with monitors, and that the characters will be viewing a lot on a screen. They have chosen to use a dark background and bright, but slightly dimmed writing for the title. The black background gives the sense of fear, and fearful anticipation of the unknown, as darkness is usually associated with danger in this context. The dimmed writing looks like writing you would see towards the bottom corner of an old monitor screen while looking back at a recording. This further implies that the characters film/record things, and then later watch them back. The title tells us they may be looking back to see 'paranormal activity' / supernatural activity. The writing is in capitals, making it stand out, creating a sense of important.
The actual title 'Paranormal activity' tells the audience that this is a horror film. Using the word 'Paranormal' implies that it is a supernatural horror film. The writing is also disjointed, and out of line. This could be trying to represent disruption of what is normal, and potential chaos in these characters lives.
Once again, the use of dark colours and dimmed light writing is being used to create the sense of fear. The font looks like a child has written it, implying a child, or children are going to be involved in the story, symbolizing innocents. The title words 'the ring' is within a ring itself. This is not a neat ring either, it is roughed edged, and hazy a round the edges. Some people may think that the circle/ring looks scratched into the surface, implying violence in the film. However, when I look at this ring, I think the ring has been created by a person, using salt - something used to keep spirits out (or in...). The ring itself is implying a supernatural presents within the movie. The idea of a spirit being unable to cross this 'barrier', creates a sense of isolation, and being trapped. On this image, I can see, what appears to be static, as if it too, is being seen through a screen/monitor. Like the Paranormal Activity title, the static is being used to tell the audience that supernatural activity is being viewed through a screen. And again, the writing is disjointed, also potentially representing chaos in one, or more, of the characters lives.
All these things help the audience see that this movie is a horror. Mixed with the idea of a supernatural barrier, we can infer that this is a supernatural horror film.