Adding Transitions:

Step 1: To add a transition, such as a cross fade, click on the vertical line between two clips in the Timeline. You should see a brown area, like a thick I between the clips.
Step 2: Now select a transition in the Final Cut Pro menu at the top by clicking on: Effects... then…Video Transitions
Step 3: Then click on a subfolder such as Cross fades. Lastly, click on the file for the transition you want to apply. When you've clicked on the desired transition file, just hold down your mouse button and drag the file down from the Browser to the point between your clips in the Timeline and release your mouse button.
Step 4: You should see the transition appear as a little gray area between the two clips in your Timeline.
Step 5: You should see a GREEN line appear just above the transition on the Timeline, which means the transition has been applied and you can view it now.
(If there's a RED line above the transition instead of a green line, that means you'll need to render the transition before you can play and view it.)
(You also can make changes in your transition by double clicking on the transition in the Timeline.)
*You can change the duration of the cross fade.*
Step 6: To do that, you should double click on the transition. In the box that appears in the Viewer area at the top of your screen, just type a new number into the time box, which usually is set at a 1 second duration by default.
(You can set a transition either in number of seconds or in number of frames or a combination of both.)
Step 7: If you don't like the transition you've created, you can click on it and press the DELETE key to remove it.

Adding Credits:
Step 1: Open Video Generators (this is under the Effects tab of the Browser), and then open Text and click "Scrolling Text." The Viewer will open a Scrolling Text screen. Select the "Controls" tab.

Step 2: Enter the titles into the Text box. This can be pasted from another source. The computer will NOT automatically break up the text, so each line must be indicated by pressing "Return.”

Step 3: Adjust the properties with the standard Font, Size, Style, Alignment and Color controls which are located immediately beneath the Text box.
Step 4: Set the Leading percentage. This creates a blank area, expressed as a percentage of the length, at the beginning of the text. For immediate onscreen text, leave Leading set to 0%.

Step 5: Click the Video tab. The running length of the titles is found in the upper left corner of the viewer pane. Click on this, and set it to the desired length. If unsure, read the credits aloud in an even and understandable pace (similar to normal conversation). Time this reading, and use it as a guide for the title's running time.

Step 6: Drag the clip to the Timeline. If the titles are to run over video, place the clip in the desired location on top of the video in v2. If plain text over a black background is desired, enter the clip into the main Timeline.
Step 7: Save, render and save project again.